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a group of metallic elements that have two electrons in their outer shells and react easily with other elements. Group 2 in the periodic table.
usually metal atoms that lose electrons and become positive ions.
the separation of a dye into the different colours that make up that dye, as a result of the...
mass per unit volume of a substance. The number of molecules in a particular area or a measure...
electromagnetic waves, similar to X-rays, but with a much shorter wavelength.